Indicating attachment for typewriters



Sqpt. 17, 1929.

J. SCHLEINZER INDICATING ATTACHMENT FOR TYPEWRITERS Filed March 28, 1928 Inventor Attorney By M UNITED STATES PATENT OFFICE JOHN SCHLEINZER, OF ROCHESTER, NEW YORK INDICATING ATTACHMENT FOE TYPEWRITERS Application filed March 28, 1928. Serial No. 265,455.

The object of this invention is toprovide a new and useful attachment for typewriters by which a signal will be given when the operator has written on a line that is near the bottom or near a predetermined point on the sheet.

Another object of this invention is to cause the device that feeds the paper through the machine to ring a bell and thus give a signal when a predetermined length of the paper has been fed through the machine.

This and other objects of the invention are fully'illustrated in the drawings.

In the drawing:

Figure l is a side elevation of my improved attachment as it appears on the carriage of the typewriter.

Figure 2 is a top plan view of my improved attachment to the carriage of the typewriter as shown in Figure 1.

In' the drawings reference numeral 1 indicates the end frame of the carriage of the typewriter, 2 indicates the platen roller that feeds thepaper in the typewriter and 3 in- ,dicates the shaft that carries this roller.

On this roller is provided a pinion 4 which meshes with the rack 5 carried in a guide sleeve 6. As the roller is turned to feed the paper, the rack moves forward being driven by the pinion 4. On the left hand end of the rack as shown in Figure 1 is provided a lug 7. The rack sleeve is supportedrfrom a bracket 8 which in turn is pivotally mounted on the end frame, the pivot 9 being provided for this purpose.- This bracket-is offset at 10 as indicated in Figure 1 to form a ledge or shoulder that can be engaged by the locking pawl 12 which is pivotally mounted on the frame at 13. As long as the rack is in the position shown in Figure 1- it engages the pinion l and is moved thereby. It is held in this position by a sprin pressed pin 14k mounted in a sleeve 15 whio 1 is carried on the end frame of the carriage. When it is desired 'to throw this attachment out of operation, the operator pushes down on the lug 7 and rocks the sleeveand rack on the pivot 9 pushing up on the pin 14 in so doing. While in this position the pawl 12 can be swung forward at the bottom to engage with the shoulder 10 and lock the-rack with its forward end in elevated position. The pawl 12 is cam shaped at the lower right hand corner so that the movement of the pawl 12 will of itself swing the rack to the idle position. As the roller 2 turns when the rack is in active position, it is driven out to the right as shown in Figure 1 and at the end of its movement is in an extended position. A spring 16 is provided which at its right-hand end in Figure 2 is attached to the pin 17 carried on the rack and at the left hand end is attached to the pin 18 provided on the sleeve 6. By pushing down on the lug 7 when the rack is in extended position or partly extended, the rack is disengaged from the pinion 4; and the spring 16 contracts to pull the rack back at once to its normal position in the sleeve.

On the end frame of the carriage is provided a stationary guide bar 20. On this is mounted a slide 21 on which is carried a bell 22 which is provided with a hammer 23 and a trigger 2-i. When the rack 5 is extended the oflset lug 28 on the end of it engages with the pawl 26 on trigger 24 which causes the hammer to raise to a certain point where it passes the pawl when it is released and is then drawn down by the spring 25 which causes the hammer to strike the bell and ring it, and the bell is thus rung whenever the rack has moved past the predetermined point. The trigger 24 is provided on the bottom with a pawl 26 pivoted at 27. The pawl and trigger all move together when the rack moves to the right until the lug 28 on'the rack has passed beyond the pawl 26. Then the hammer drops and at the rearward movement of the rack the pawl 26 can yield and permit the lug 28 to pass thereunder.

As shown in Fig. 2 the movable slide 21 is provided with a pointer 31 which points to mar-ks on the stationary scale 32. The slide and thebell can be shifted and its position will be indicated on the scale, and this will indicate whether the rack will engage it after a long movement or a short movement. On the side of the stationary guide 20 are provided recesses 33 with which en- 'isnear the bottom of the page or at the desired point where the letter must be stopped on that page so that she can then remove the sheet from the machine without looking at it. This will enable the operator to make the several pages of the letter with uniform margins at the bottom without having to pay any especial attention thereto.

, The rack 5 is mutilated near both ends so that when it comes to the end of its movement in either direction it willon that acgagement with the pinion.

count stopand cannot be forced by turning the platen by hand. This provision is made so as to make it impossible to strip the'teeth from either the rack or the pinion.

The sleeve 6 at the left hand end of Figure 1 is ovided with a spring 40 which acts as a cushion in stopping the return movement of the rackdue to the contracting of the spring 16. This spring cushion 40 also permits the rack to yield when the platen is turned by hand so that in this way the stripping of a tooth is prevented, and when released it throws the rack forward so as to make enlt has also been found desirable to make each of the teeth of the pinion 4 formed with an edgeon top rather than a broad surface so as to avoid dead centering the teeth of the pinion and the teeth ,of the rack.

it will also be observed that when the rack is in an extended position with the mutilated part of the rack above the pinion the finished sheet may be removed from the machine in the usual way without disturbing the position of the rack. Thereafter the next sheet can beinserted in the machine by turning the platen in the same direction without disturbing the extended position of the rack. When the sheet is in approximately the correct position, the operator pushes down on the lug 7 which will cause the rack to be disengaged from the pinion so that it can be drawn back into normal position by the spring in which position the other mutilated portion of the rack will be over the pinion permitting the platen to be turned in the reverse direction to bring the paper to the correct starting position without disturbing the starting position. of the rack. I claim: a

1. in a typewriter carriage, the combination of an end frame, a shaft mounted to rotate therein, a roller platen carried by said shaft, a pinion on said shaft, a guide sleeve mounted to rock on said frame, a rack mount ed to slide in and out of said guide sleeve';-.

means? spring pressed means carried by said frame and engaging said sleeve to rock said sleeve in one direction and hold said rack yieldingly in meshwith said pinion, a locking pawl pivoted on said frame and adapted to rock said sleeve in the opposite direction against the pressure of said spring pressed means and hold said rack out of mesh with c said pinion. a

2. in a typewriter carriage, the combina tion of an end frame, a shaft mounted to rotate therein, a roller platen carried by said shaft, a pinion on said shaft, a guide sleeve mounted to rock on said frame, a rack mounted to slide in and out of said guide sleeve, spring pressed means carried by said frame and engaging said sleeve to rock said sleeve in one direction and hold said rack yieldingly in mesh with said pinion, a locking pawl pivoted on said frame and adapted to rock said sleeve in the opposite direction against the pressure of said spring pressed means and hold said rack out of mesh with said pinion, a spring connected to said rack and adapted to return said rack to its start-- ing position when said rack is swung out of mesh with said pinion, a cushioning memher in said guide sleeve to cushion the re turn movement of said rack into said guide sleeve and yieldingly hold the first tooth of said rack in mesh with said pinion when held in contact therewith.

3. In a typewriter carriage, the combination of an end frame, a shaft mounted to rotate therein, a roller platen carried by said shaft, a pinion on said shaft, 2. guide sleeve mounted to rock on said frame, a rack mounted to slide in and outof said guide sleeve, spring pressed means carried by said frame and. engaging said sleeve to rock said sleeve in one direction and hold said rack yieldingly in mesh with said pinion, a locking pawl pivoted on said frame and adapted to rock said sleeve in the opposite direction against the pressure of said spring pressed means and hold said rack out of mesh with said pinion, a guide bar carried by said frame, a signal mounted to slide on said guide bar, yielding means carried by said signal and projecting into the path of the rack on the movement thereof in one direction, 

